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An Additive of Sulfonic Lithium Salt for High‐Performance Perovskite Solar Cells
Author(s) -
Luo Hui,
Wu Jihuai,
Liu Quanzhen,
Zhang Mingjing,
Yuan Pengqiang,
Huang Miaoliang
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802109
Subject(s) - crystallinity , materials science , perovskite (structure) , lithium (medication) , energy conversion efficiency , mesoporous material , chemical engineering , grain boundary , perovskite solar cell , grain size , photovoltaic system , doping , salt (chemistry) , inorganic chemistry , optoelectronics , composite material , chemistry , organic chemistry , catalysis , electrical engineering , medicine , microstructure , engineering , endocrinology
The perovskite layer has an important influence on the photovoltaic performances of perovskite solar cells (PSCs). In order to improve the morphology and crystallinity of the perovskite film, the additive of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is introduced in the perovskite precursor solution. And the perovskite solar cell with architecture of FTO/compact TiO 2 /mesoporous TiO 2 /CH 3 NH 3 PbI 3 /spiro‐OMeTAD/Au is fabricated. By optimizing the concentration of LiTFSI, the fabricated PSC shows the best power conversion efficiency of 17.30% with a fixed device area of 1.5×1.5 cm 2 under one sun illumination, while the device without LiTFSI introduction has an efficiency of 15.53% at the same test condition. The morphology observation and photoelectrical characterization demonstrate that the significant improvement of the device performance results from the charge carrier's fast transportation and less recombination for larger grain sizes and fewer grain boundaries by doping LiTFSI into perovskite precursor solution.